WhatWeb is a next generation web scanner that identifies what websites are running. Flexible plugin architecture with over 80 plugins so far. Passive plugins use information in the headers, cookies, HTML body and URL. Aggressive plugins can identify versions of Joomla, phpBB, etc by making extra requests to the webserver.
You can download it from the following link: https://packetstormsecurity.com/files/download/91452/whatweb-0.4.4.tar.gz
Source: https://packetstormsecurity.com/files/91452/WhatWeb-Scanner-0.4.4.html